Our sophisticated knowledge base and innovative product line promote quality green building methods, energy efficiency, comfort and health.

Transcription

1 We provide specialized building supplies, expert guidance, and advanced education to architects, contractors, building owners, and construction industry professionals. Our sophisticated knowledge base and innovative product line promote quality green building methods, energy efficiency, comfort and health. Dan Berteletti -- Jackie Burnett --

2 IECC 2015 BUILDING ENERGY CODE: The intent is to advance the trades with the latest and best practice of building science and reduce the overall impact of the building sector on the environment.

3 IECC 2015 BUILDING ENERGY CODE: FOCUS IS ON BUILDING ENVELOPE attic Conditioned Space crawl space

4 THE IMPORTANCE OF THE BUILDING ENVELOPE This is a fish in a state of comfort at home in his fish bowl. 4

5 THE IMPORTANCE OF THE BUILDING ENVELOPE Let s draw an analogy Your House You 5

6 THE IMPORTANCE OF THE BUILDING ENVELOPE To keep our fish friend comfortable, we add water as needed. In a similar fashion, you add energy to your house to keep comfortable. Some of the water (or energy) is clean Some is less clean

7 THE IMPORTANCE OF THE BUILDING ENVELOPE Things become more serious, however, when there is a crack in the fish bowl. To keep our fish friend comfortable, we need to add more and more water.

8 THE IMPORTANCE OF THE BUILDING ENVELOPE Until eventually we are spending a lot of money simply trying to maintain a decent level of comfort. All because the fish bowl has a crack.

9 THE IMPORTANCE OF THE BUILDING ENVELOPE What s the solution? Sometimes the most economic solution is fixing the crack. ottobre 2014

10 THE IMPORTANCE OF THE BUILDING ENVELOPE What s the solution? Sometimes the most economic solution is fixing the crack. Other times, it makes sense to buy a newer, thicker, and more resistant bowl. ottobre 2014

11 THE IMPORTANCE OF THE BUILDING ENVELOPE Either way, to avoid having to add lots of water in the future, it s smarter to invest in the fish bowl not the water tap. ottobre 2014

12 HOW CAN OUR FISH FRIEND HELP US TO RETHINK THE IMPORTANCE OF OUR BUILDING ENVELOPE?

13 WHAT MAKES UP YOUR BUILDING ENVELOPE? Structure: Walls Windows/Doors Roof/Ceilings Floors Foundation Variables: Thermal insulation Moisture diffusion Air infiltration Solar heat gain attic Conditioned Space crawl space

14 WHAT ARE THE BENEFITS OF YOUR BUILDING ENVELOPE? Durability Safety Health Comfort Protection against Weather Fire Insects, Rodents, Bigger Animals IAQ, Odors, Noise attic Conditioned Space crawl space

15 WHAT ARE THE BENEFITS OF YOUR BUILDING ENVELOPE? Durability Safety Health Comfort attic As we build tighter, control of air infiltration and moisture management becomes critical. Conditioned Space crawl space

16 HOW DO WE ACHIEVE A ROBUST BUILDING ENVELOPE? Let the building code guide us: A continuous air barrier shall be installed in the building envelope. The exterior thermal envelope contains a continuous air barrier. Breaks or joints in the air barrier shall be sealed.

17 Air Barrier - Definition Any durable, solid material that blocks air flow between conditioned space and unconditioned space, including necessary sealing to block excessive air flow at edges and seams.

18 Air Barrier - Definition Any durable, solid material that blocks air flow between conditioned space and unconditioned space, including necessary sealing to block excessive air flow at edges and seams. Ensures low air infiltration rates Controls air leakage through the building envelope Controls ventilation for fresh air ->ACH Controls conductive heat transfer through exterior walls

19 Air Barrier Types Building Sheet Wraps Dupont Tyvek SIGA: Majvest & Majcoat ProClima: Intello & Solitex Grace Vycor & Ice and Water Shield Rubber membranes Polyethylene film Typar Tar/Building Paper Plywood, OSB, ZIPs w/taped Seams Self-Adhered Sheet Membranes Liquid Applied Membranes Spray Foam

20 Air Barrier - Sealing Penetrations Chimney Ceiling Lights Attic Hatch Window Floor Wiring Exterior Door Foundation Plumbing

21 HOW DO WE ACHIEVE A ROBUST BUILDING ENVELOPE? Let the building code guide us: Exterior thermal envelope insulation for framed walls shall be installed in substantial contact and continuous alignment with the air barrier

22 HOW DO WE ACHIEVE A ROBUST BUILDING ENVELOPE? Let the building code guide us:

23 Insulation Types Interior and Exterior Fibrous Insulation Fiberglass Batt Mineral Wool Slag Wool Cellulose (dense-packed) Foam Plastic Insulation: Polyisocyanate Spray Polyurethane foam Expanded polystyrene (EPS) Extruded Polystyrene (XPS)

24 Building Energy Code - Envelope Points of Focus: Air Sealing: Management of liquid water (rain and ground water), airflow, water vapor flow, and heat flow. Insulation: Prevent your sheathing from getting cold enough for condensation (moisture accumulation) to be a problem. Quality Control during installation Durability: Winds load, Seismic Movement, Thermal Expansion Frost/Thaw Goals: Vapor Open / Vapor Closed Wall assembly. Remove dew point from within wall cavity. Air Sealed sufficiently to meet Blower Door Test. Predictable, long lasting results. Risk management plan.

25 Insulation Interior and Exterior Overall R-Value: Reduce heat losses in Walls, Roofs, and Floors R-Value is not enough: Exterior Insulation Eliminate thermal bridging Keep wall sheathing warm The thermal performance of a wall is greatly improved when wall sheathing is protected by an exterior layer of insulation. Reduce condensation risk Exterior wall insulation keeps wood warm, keeps wood dry, reduces the condensation potential, reduces thermal bridging, and probably increases the durability of the wall. Ratio of Exterior to Interior Insulation is Critical

26 HOW DOES BUILDING CODE INTEGRATE INTO BUILDING ENVELOPE DESIGN? Vapor Closed Vapor Open

27 Wall Assembly - Components INSIDE Drywall Vapor Control Layer Cavity Insulation Framing/Structure Exterior Sheathing Exterior Insulation Air Barrier Control Water Control Siding OUTSIDE INSIDE OUTSIDE

28 Wall Assembly - Vapor Open INSIDE OUTSIDE

29 Wall Assembly - Vapor Closed

30 WALL ASSEMBLY climate zone 7 - meets code, does NOT pass test Saturation Vapor Pressure Internal-External Vapor Pressure w/condensation

31 WALL ASSEMBLY climate zone 7 - meets code, passes test Saturation Vapor Pressure Internal-External Vapor Pressure w/condensation

32 WALL ASSEMBLY climate zone 7 - meets code, passes test Saturation Vapor Pressure Internal-External Vapor Pressure w/condensation

33 WALL ASSEMBLY climate zone 7 - meets code, passes test Saturation Vapor Pressure Internal-External Vapor Pressure w/condensation

34 OUTSIDE Siga Majvest XPS rigid insulation 2.0 R-15 (R-10) 7/16 OSB 2x6 with dense packed cellulose (R-20) drywall INSIDE WALL ASSEMBLY climate zone 7 - meets code, does NOT pass test Saturation Vapor Pressure Internal-External Vapor Pressure w/condensation

35 OUTSIDE Siga Majvest XPS rigid insulation 2.0 (R-10) 7/16 OSB 2x6 with dense packed cellulose (R-20) Siga Majpell drywall INSIDE WALL ASSEMBLY climate zone 7 - meets code, passes test Saturation Vapor Pressure Internal-External Vapor Pressure w/condensation

36 OUTSIDE Siga Majvest Mineral Wool Ins (R-10) 7/16 OSB Mineral Wool batt R-23 Siga Majpell drywall INSIDE WALL ASSEMBLY climate zone 7 - meets code, passes test Saturation Vapor Pressure Internal-External Vapor Pressure w/condensation

37 Success is Delivered in the Details Dan Berteletti -- Jackie Burnett --